Rob Flinn said:
Jeff
Sorry if I'm missing something that you have already explained, but I trolled through this thread & didn't seem to find what I was looking for.
Could you explain in a bit more detail the functionality of the 812d discreet monitor channel ?
I was looking into the possibility of building a smallish line mixer & was wondering if these modules have functionality for monitor & echo sends etc ?
Hey Rob,
I have been working on a full description to publish on the site since I have had quite a few people ask what you have just asked! I seem to be getting side-tracked a lot lately. I have 2/3rds of the text written but need to complete it.
So, in the meantime, here is a brief rundown:
The card is size and plug-in compatible with the original API 812 series of modules. Pin outs are compatible with the originals. I have also incorporated a few useful functions that were never made available originally. I have also disabled a few things on my board like the the Sync/Master Sync functions. Essentially, with a few little mods and some additional summing...these will drop right into a vintage console.
The basic circuit is a 2 stage, all discrete replication of the
input channel of my board. The new ones are line in only.
4 Echo sends, 1&2 are switchable pre-post fader
2 Cue sends switchable pre-post fader
L-R stereo pan
Phase reverse
Mute
Solo(destructive like the original)
2 switch, 3 HP filter array, 60, 100 and 200hz
Balanced send via 2623-1, unbalanced return
Outboard fader required, mine are 5K
Stereo bus on/off
And lastly, a toggle to select what is being metered, input channel or monitor channel. This is a little weird but that is how it was. The meter buffer is on the monitor card. Only 32 meters and 64 inputs, so selection is needed.
I will not have sub-groups on these channels but they can also have 16 group buses added pretty easily. The 2nd 2520 DOA will drive them with no problem.
So, even though I refer to them as "monitor" channels, it is really only related to the size format for my board. Circuit wise, they are "input" channels with no group buses. They are .75" wide by 10.65". As soon as this project is underway, I will finish the 500 size format. I have it started just to make sure it is physically possible....and it is
Unique and dedicated PCB backplanes required, Volker is the man!
8)
Oh, just remembered...there is a little more info
here on this thread.
Cheers, Jeff